MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador descarregar pdf (Página 144)

3 Writing S-Functions As C-MEX files

3-100

ssSetOptions

(S,options)

(continued)

SS_OPTION_ASYNCHRONOUS — This option applies onlyto S-functions

that have 0 or 1 input ports and 1 output port. The output p ort

must be configured to perform function call s on every element. If

any of thes e requirements are no t met, the

SS_OPTION_ASYNCHRONOUS is ignored. Use this option when d riving

function-call subs yste ms that will be attached to interrupt service

routines.

SS_OPTION_ASYNC_RATE_TRANSITION —Usethiswhenyour

S-function converts a signal from one rate to another r ate.

SS_OPTION_RATE_TRANSITION — Use this option when your

S-function is behaving as a unit delay or a ZOH. This macro

support these two operations only. It identifies a unit delay by the

presence of

mdlUpdate;ifmdlUpdate is absent, the operation is

taken to be ZOH.

Table 3-5: General SimStruct Macros (Continued)

Macro Description

1 2 ... 139 140 141 142 143 144 145 146 147 148 149 ... 209 210

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MATLAB SIMULINK 7 - DEVELOPING S-FUNCTIONS Guia do Utilizador Página 144